Straightway valve.



PATENTED PEB. 10, 1903.

E. M. ERDMAN.

STRAIGHTWAY VALVE. APPLICATION FILED 00T. z5, 1902.

N0 MODEL.

UNITED STATES PATENT OFFICE.

EDWARD M. ERDMAN, OF POTTSVILLF., PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOWILLIAM J. MATZ, OF POTTSVILLE, PENNSYLVANIA.

STRAIG HTWAY VALVE.

SPECIFICATION forming part of Letters Patent No. 720,012, dated February10, 1903.

Application liled October 25.1902. Serial No. 128,819. (No model.)

T0 1J/Z wil/0m. it may concern:

Be it known that I, EDWARD M. EEDMAN, a citizen of the UnitedStates,residing at Pottsville, in the county of Schuylkill and State ofPennsylvania, have invented certain new and useful Improvements inStraightway Valves; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the figures ofreference marked thereon, which form a part of this specification.

This invention relates to straightway valves for water, steam, gas, andthe like; and its object is to provide a straightway valve in whichthere shall be a free and uninterrupted iow through it when open, whichshallautomatically bring a plate or plates into position to shut off theiow when the valve is closed and at the same time automatically forcesaid plate or plates tightly against the seat or seats providedtherefor, and which shall have only so much angular movement in openingand closing as shall suffice to fully open and close the port.

The invention is in some respects similar to the straightway valve forwhich I obtained a patent on September 16, 1902, No. 709,146, but issimpler in construction and operation than that one.

My invention consists 0f a turning-plug straightway valve in which theplug is cylindrical and has a transverse port through it. In one or bothsides of the plug between the ends of the port are recesses in which aplate Jits, the outer surface of the plate being normally iiush with thesurface of the plug. The plate is wide enough to completely cover theopening through which the fluid to be controlled is brought to thestraightway valve. The upper and lower ends of the plate are chamferedoff and the plug has a beveled uu-s dercut portion to cooperate with theupper chamfer, while the bottom of the casing in which the plug turnshas a similar bevel to cooperate with the lower chamfer. A shoulder onthe plug engages with a lip below the upper chamfer, so that the plateis carried up and down with the plug as it turns, the plug having ascrew-threaded stem to giveit this endwise movement in opening andclosing. When the valve is closed, the plug moves downward, and thebeveled portion on the plug and the casing operates to force the platelaterally away from the plug and tightly against the wall of the casingadjacent to the inlet or outlet, or both.

In the accompanying drawings, Figure 1 is a top plan view of a valveembodying my invention, the casing being uncovered and the valve beingopen. Fig. 2 is a longitudinal section of the same on the line 2 2, Fig.l.

Fig. 3 is a top plan view of the valve closed. Fig. 4 is a longitudinalsection of the same on the line 4 4, Fig. 3. Fig. 5 is an elevation ofthe turning plug. Fig. 6 is a perspective view of a plate.

The drawings show a straightway valve provided with two plates-one forclosing the inlet and the other the outlet of the casing.

Although the latter plate could be dispensed with, it' desired, yet forthe sake of simplicity I shall confine the following description to theconstruction shown.

The casing l has aninlet 2 and an outlet 3 opposite to each other. Theinterior of the casing is cylindrical to receive the cylindrical turningplug 4, which has a screw-threaded stem 5, meshing with screw-threads ina boss 6, projecting from the center of the top 7 of the casing andhavinga suitable handle 8. The plug has a transverse port 9, whichregisters with the inlet and outlet when the valve is open, as shown inFig. 1. The bottom of the plug may have a central pin lO, entering asocket 11 in the bottom of the casing, to assist in centering it in thecasing. The plug is slightly less in length than the casing, and thepitch of the screw-threads on the stem is such that when the valve isopen the plug abuts against the top of the casing, as shown in Fig. 2,and. when closed it rests solidly 'on the bottom of the casing, as shownin Fig. 4. The top and bottom of the casing thus act as stops to`determine the proper positions of the plug when open and closed. Inopposite sides of the plug between the ends of the port 9 are recesses12, extending the full length of IOO the plug and having at their upperends a shoulder 13 and a deeper undercut bevel 14. In each recess is aplate 15, having its outer surface curved to lie flush with that of theplug when the plates stand close to the plug, as shown in Fig. 2. At theupper end of each plate is a lip 16 to engage with the shoulder 13, bymeans of which the plate is carried up and down with the plug as itturns.y

Above the lip is a chamfered portion 17, cooperating with the bevel 14on the plug. The lower end of the plate has a projecting lip 18, belowwhich is a chamfered portion 19, cooperating with a beveled groove 20,around the outer edge of the bottom of the casing. When the valve isopen, the space between the chamfer 19 and the bevel 20 is a little lessthan that between the bottom of the plug and the bottom of the casing.The lip 18 also stands a little above the bottom of the casing.

The operation is as follows: Suppose the valve to be open, as shown inFigs. 1 and 2. The plates rest in the recesses and the plug is free tobe easily turned by its stem. To close the valve, the stem is given aquarterturn, which carries the plug down against the bottom of thecasing, as shown in Fig. 4, and swings the plates around opposite theinlet and outlet. Just before the plug seats on the bottom of the casingthe chamfer 19 strikes the bevel 20, and then the two beveled surfaces14 20 act to force the plates laterally away from the plug and tightlyagainst the walls of the casing adjacent to the inlet and outlet, thusclosing these openings very effectually and preventing all leakage. Whenthe plug is turned back to open the valve, the plates are loosened andthe plug can thus turn easily.

Having thus described my invention, what I claim is- 1. In a straightwayvalve, the combination with a turning plug having a transverse port anda recess in one or both sides provided with a beveled upper portion, ofmeans for moving said plug endwise in opening and closing, a casinghaving a beveled groove in its bottom, and a plate in each recess havingchamfered portions at each end to coperate with the bevels 0n the plugand casing.

- 2. In a straightway valve, the combination with a turning plug havinga transverse port and a recess in one or both sides provided with abeveled upper portion and a shoulder adjacent thereto, of means formoving said plug endwise in opening and closing, a casing having abeveled groove in its bottom, and a plate in each recess having at itsupper end a lip to engage with the shoulder and a chamfered portion tocoperate with the bevel on the plug, and a chamfered lower end tocoperate with the beveled groove in the bottom.

3. In a straightway valve, the combination with the turning plug 4, ofthe screw-threaded stem 5, the casing 1 somewhat longer than said plug,and the plates 15 having the lips 16, 18 and the chamfered portions 17,19, said plug having the recesses 12 provided with shoulders 13 andbeveled portions 14, and said casing having in its bottom the beveledgroove 20', all arranged and operating substantially as hereinbefore setforth.

In testimony whereof I affix my signature in presence of two witnesses.

EDWARD M. ERDMAN.

Witnesses:

E. K. PHILLIPS, FRANK LITTLE.

